Manieold eor internal-combtjstion engines



E. C. RICHARD AND W. G. HEGINBOTTOM.

MANIFOLD FOR INTERNAL COMBUSTION ENGINES.

APPLICATION FILED sPT.29. I911- 1,323,378.

Patented Dec. 2, 1919.

%1;, m a Mmm UNITED STATES lPATENT OFFICE.

EUGENE C. RICHARD AND WALTER G. HEGINBOTTOM,

OF FLINT, MICHIGAN, ASSIGNORS TO GENERAL MOTORS CORPORATION, OF DETROIT,MICHIGAN, A CORPORATION OF DELAWARE.

MANIFOLD FOR INTERNAL-COMBUSTION ENGINES.

Specification of Letters Patent.

Patented Dec. 2, 1919.

Application filed September 29, 1917. Serial No. 194,061.

To all whom it may concern:

Be it known that we, EUGENE C. RICHARD and IVALTER Gr. Hncmcorrosr, bothcitizens of the United States of America, both residin at Flint, in thecounty of Genesee and State of Michigan, have invented certain new anduseful Improvements in Manifolds for Internal-Combustion Engines, ofwhich the following is a specification, reference being had therein tothe accompanying drawings.

The invention relates to internal combustion engines and has particularreference to a manifold construction bywhich proper temperatureconditions are maintained in the intake. It is a well-known fact thatthe warming of the intakemanifold is advantageous in producing a properexplosive mixture, but, on the other hand, the overheating of thismanifold is detrimental. Thus, if the intake manifold is integral withthe exhaust manifold or is connected thereto by good heat-conductingmeans, there is danger of overheating. In the present invention we havearranged the intake and exhaust manifolds in proximity so that heatradiated from the one will be absorbed by the other, and at the sametime have secured these manifolds without any direct mechanicalconnection therebetween which would transfer heat by conduction.Inasmuch as the transfer of heat by radiation is much slower and moreuniformly distributed than transfer by conduction, our improvedstructure has the advantageof imparting just the right degree of heat tothe indrawn explosive mixture.

In the drawings:

Figure 1 is a side elevation of the manifold; and Fig. 2 is a verticalcross section through 1.

A is the intake manifold of a multicylinder engine and B is the exhaustmanifold thereof. Each of these manifolds is provided with a pluralityof inwardly-extending tubes C C, etc., D D, etc., for connecting withthe inlet and exhaust passages of the several cylinders.

To provide for the transference of heat by radiation the manifolds A andB are constructed with portions lying parallel to each other but spacedso as to avoid direct mechanical contact and heat conduction. Thisarrangement is conveniently obtained by arthe space between the inletmanifold and the I engine cylinders and the, machined face E of theexhaust manifold lies parallel and adjacent to the machined face F ofthe intake manifold. Clamps G may be used for securing the manifolds tothe engine cylinders, the ends of said clamps bearing at H and H" uponcooperating bearings of the exhaust manifold and set-screws I arrangedcentrally of the clamps bear against co operating hearings on the intakemanifold. The clamps themselves aresecured by bolts or studs J whichextend outward from the cylinder-block intermediate the tubes C and D.

-With the construction described the manifolds are easily mounted andtaken off and when in position will be uniforml spaced throughout theentire extent of t eir machined surfaces E and F. Whenever the engine isin operation the heat of the exhaust manifold is radiated to theadjacent face of the inlet manifold and by properly proportioning theextent of surface any desired heating effect may be produced.

What we claim as our invention is:

1. In an internal combustion engine, the

combination of intake and exhaust manifolds combination of intake andexhaust manifolds having oppositely-facing machined surfaces, and meansfor securing said manifolds with said opposite surfaces uniformly spacedand maintained out of heat-conducting contact with each other.

4. In an internal combustion engine, the combination of intake andexhaust manifolds arranged one in the s ace between the engine and theother and 0th having adjacent parallel faces, and laterally-extendingportions of said manifolds for connecting the same with the respectiveengine cylinders and also constituting a means for holding said parallelsurfaces uniformly spaced and out of heat-conducting contact with eachother.

In an internal combustion engine, the combination of intake and exhaustinanifolds one arranged in the space between the engine and the otherand having adjacent flat parallelly-arranged surfaces for the radiationof heat from one to the other, and connections between said manifoldsand the respective engine cylinders formingmeans for securing anduniformly spacing said an outer-fiat machined face, an intake inanifoldarranged at the side of the outer face of said exhaust manifold andhaving an inner fiat machined faceparallel to the outer face of saidexhaust manifold, and tubular connections between said manifolds and therespective engine cylinders dimensioned to space said parallel surfacesand hold the same out of heat-conducting contact 'With each other.

7. In an. internal combustion engine the combination with an intakemanifold of an exhaust manifold, said manifolds having adjacent machinedsurfaces spaced from each other a predetermined distance to provide apredetermined amount of heat-radiation from one surface to the other.

In testimony whereof We affix our signatar-es.

EUGENE C. RICHARD. WALTER Gr. lrlEGlNlBOlTOh/l.

